I use this RSS viewer in the footer of a HTML page of one of my websites to list recent WordPress blog entries.
Recently the list of entries disappeared from the HTML footer. The W3C validator validates the URL but shows a long list of recommendations.
I updated the PHP from 7.1 to 7.4 (8.1 immediately broke both wordpress and the blog, and didn't even allow me to log in the admin tool), but I still can't use RSS Viewer to list recent blog entries at the bottom of my HTML page, even with all the plugins disabled.
I am using the latest version of WordPress (6.6.2).
What are my options and what can I do?